1/1×5+1/5×9+1/9×13+...+1/2009×2013
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1/1×5+1/5×9+1/9×13+...+1/2009×20131/1×5+1/5×9+1/9×13+...+1/2009×20131/1×5+1/5×9+1/9×13+...+1/2009×20
1/1×5+1/5×9+1/9×13+...+1/2009×2013
1/1×5+1/5×9+1/9×13+...+1/2009×2013
1/1×5+1/5×9+1/9×13+...+1/2009×2013
答：
1/(1×5)+1/(5×9)+1/(9×13)+...+1/(2009×2013)
=(1/4)×(1-1/5+1/5-1/9+1/9-1/13+.+1/2009-1/2013)
=(1/4)×(1-1/2013)
=(1/4)×(2012/2013)
=503/2013
1/5*1/9+1/9*1/13+1/13*1/17+.1/101*1/105
1*5/1+5*9/1+9*13/1+13*17/1+17*21/1
1/1*5+1/5*9+1/9*13+1/13*17+1/17*21
1*5/1+5*9/1+9*13/1+13*17/1+.45*49/1
1/1×5+1/5×9+1/9×13+1/13×17+...+1/25×29=
1/5*9+1/9*13+.+1/101*105
1*1/5+1/5*1/9 1*1/5+1/5*1/9+1/9*1/13+1/13*1/17 计算
计算1/1*5+1/5*9+1/9*3+.+1/81*85计算1/1*5+1/5*9+1/9*13+......+1/81*85
1/7*5+1/7*9+1/9*11+1/11*13+1/13*15
(9分之5+13分之1)*9+13分之4
计算:1/3*5+1/5*7+1/7*9+1/9*11+1/11*13
数学题1*5/1+5*9/1+9*13/1 .+33*37/1=?
1/1*5+1/5*9+1/9*13+.+1/101*105
1/1×5+1/5×9+1/9×13+...+1/2009×2013
1×5/1+5×9/1+9×13/1+…+2009×2013/1
1/1*5+1/5*9+1/9*13+.+1/55*59
1/1*5+1/5*9+1/9*13+.+1/55*59
1/1*5+1/5*9+1/9*13+.+1/33*37